Sparking plug.



R. CARPENTIER.

SPARKING PLUG.

APPLICATION FILED JUINE9,1)14 V 1,1 3 1 1 1 5 Patented Mar. 9, 1915.

Wiwwses:

z novel ignition device and as already I* li' pg?) and is sufliciently Stated the sparksare produced in elosel adjacent pairs und if one of them should 'l owing to sooting up the other spark continues to hot to dissipate this sit and restablish the failing spark.

In point of fact the electrodes themselves never"become sooted up because the sparks always tend to clean these electrodes und .when the engine is stopped, it is found that the deposits of soot are ma de solely upon the edges of the plug, the electrodes themselves invariablyreinaining perfectly free from any deposit.

An embodiment of the invention is illustrated by way of examplein the aompany; ing drawing which represents the device in longitudinal section.

As shown in the drawing, the novel electrobreak device consists of two central sleeves a, b of insulating material such as porcelain for exemple, cemented external metal sockets Aa', b. The socket b ends in a conical' portion b* and the socket a is threaded for a portion of its length. at a* 'in such a manner that the said sodrets can be'united by a tapped collar c presenting a conical internal projection o which fits over the portion Iz. The collar c also presents an end for screwin the device as a whole into the cylinder en Metal rings d, e are clamped between the sleeves a and An inner metal sleeve f is fixed axially 1n the sleeve a and ends on the one hand in a shoulder f' and on the other hund in a threaded portion Upon this threaded ortion f a lixing nut g is screwed while n ook nut li servesto lock the rod e'. when it -has been adjusted. The interior of the sleeve and a threaded metal rod i can be screwed into the sleeve f. This rod i constitutes the break electrode; inside the sleeve a: it ends in a circular plate i' und outside this sleeve in a milled knob i" for operating it. Opposite and `at a small distance from the plate i" three electrodes are embedded in the insulating sleeve b a central electrodej and tufo lat 'eral electrodes le' und [ci The central electrode j is bent over toward the lower cxtreinity at two points j y" which terminate at n short distance from the end of the ciectrodcs It k ipectively. F inully two other electrodes l l* are connected to eaith at a short distunce from the electrodes le' :in d j' and Ic und j. The central electrodo j might be divided ut tivo or more mints, a corrosponding number of electro es l: and-Z bcing arranged throughout the periphery of the insulating portion. Whichever arrangement be adopted, Athe current is conducted to the central conductor i and thc electrodes l' Ylx are earthcd. A metal cap m clamped between the fiber Washer wand a shouldcr on the slceve a f is threaded throughout its entire length;

' frein the ai r,

serves to protect the porcelain of the sleeve a from lows and from injury by spanners when littn I" been adjusted and) the current being sapplied to the cent-ral conductor i as ulreu explained assuinin1r first of all that the plate 1E' 1s in contact wit i the electrodes lo', It' and y the ignition s arias ass between la', j and t and Zz an y" ancli thc device acts in the manner of an ordinary sparking plug. If the plate be'tlien separated slightly from the electrodes lx', k, j break spnrks uss betiveen the latter und `the plate-1 an the ignition sparks become hotter. In these com ditions as will be understood, it is possible to modify the distance between the' plate c" and the electrodes to i late the break sparks of this plate at w1 and in such a manner that the ignition s arks proper are rendered as hot as possib e. Moreover, if sootin should take place on theI :ith for one o the sparks, between Ic and for example, the sparks would continue to pass between l and between k, l' and j and l untile sooty deposit is itself dissipated or destroyed Lby the heat as has been ascertained experimentally.

This apparatustherefore presents the advantage of providing u constant ignition without possibility of failure; moreover as thcbreak spark can be regulated bythe dis tance of the plate i' from the electrodes', the i ultron sparks can always be produced in t e best possible conditions. 'llie sparks uro also produced at several places and if one Should fail, the others would insure the i niton until the failing spar-lr is res'talshed. As already fact that the point of rupture is located in the midst of t ic device itself, and protected any risk of fire is absolutely avoided.

What I claim and desire to secure by Lettcis Patent of the United States is:

1. l'n un explosion engine, a spark plug adapted to insure the ignition and-the spontaneous unsooting of c electrodes, oonsisting in a grou of two insulated adjacent electrodes of li polarity, terminating at a short distance -frorn a third earthed electrede, a conductor adjustable in position, terminating at a' short distance from tlio other ends of the insulated electrodes of like polarity for conducting thc current thereto through the medium of supplementary sparks produced between the sai conductor andthe insulated electrodes of like polarity.

2. In an explosion engine, u spark plug adapted to insure the ignition and the spontaneous unsooting of the electrodes, coinprising two insulating sleeves connected by metal sleeves, a closed chamber between the stated in view of the,

insulating sleeves, a group of two electrodes of like polarity embedded in the insulation of the lower sleeve, an earthed electrode terminating at a short distance from the insulated electrodes, a central conductor adjustably mounted in the insulation of the upper sleeve and conducting the current to the insulated electrodes of like Ypolarity through the medium of supplementary sparks springing forth in the closed chamber between the 10 conductor and each of the insulated electrodes.

In testimony whereof I affix my signature in presence of two witnesses.

RODOLPHE CARPENTIER. Witnesses:

CHAS. P. PRESSLY, REN THIRIOT. 

